(Tıp) Darwin tarafından ileri sürülen tabii seleksiyon esasın dayanarak türlerin kökeni ve gelişimini izah eden teori, türlerin evrimi teorisi (Bu teoriye göre yüksek sınıf hayvanlar, aşağı sınıf hayvanların, tabii seleksiyon sonucu evrimi ile meydana gelmişlerdir)
The evolution and common ancestry of all living and extinct species resulting from gradual evolutionary mechanisms such as natural selection
Theory of the evolutionary mechanism proposed by Charles Darwin as an explanation of organic change. It denotes Darwin's specific view of how evolution works. Darwin developed the concept that evolution is brought about by the interplay of three principles: variation (present in all forms of life), heredity (the force that transmits similar organic form from one generation to another), and the struggle for existence (which determines the variations that will be advantageous in a given environment, thus altering the species through selective reproduction). Present knowledge of the genetic basis of inheritance has contributed to scientists' understanding of the mechanisms behind Darwin's ideas, in a theory known as neo-Darwinism
a theory of organic evolution claiming that new species arise and are perpetuated by natural selection
Theory of evolution that represents a synthesis of Charles Darwin's theory in terms of natural selection and modern population genetics. The term was first used after 1896 to describe the theories of August Weismann (1834-1914), who asserted that his germ-plasm theory made impossible the inheritance of acquired characteristics and supported natural selection as the only major process that would account for biological evolution
The application of Darwinism to the study of human society, specifically a theory in sociology that individuals or groups achieve advantage over others as the result of genetic or biological superiority. Theory that persons, groups, and "races" are subject to the same laws of natural selection as Charles Darwin had proposed for plants and animals in nature. Social Darwinists, such as Herbert Spencer and Walter Bagehot in England and William Graham Sumner in the U.S., held that the life of humans in society was a struggle for existence ruled by "survival of the fittest," in Spencer's words. Wealth was said to be a sign of natural superiority, its absence a sign of unfitness. The theory was used from the late 19th century to support laissez-faire capitalism and political conservatism. Social Darwinism declined as scientific knowledge expanded